<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>proxy的使用</title>
</head>
<body>
  
  <script>

    
    Object.defineProperty(obj, 'key', {
      set: function (setValue) {
        
      }
    })


  </script>
</body>
</html>